mb/intel/mtlrvp: Add files required for ramstage and SMM

This patch adds files required for ramstage and SMM.
1. Add file required for ramstage (mainboard.c)
2. Add smihandler.c for SMM

BUG=b:224325352
TEST=Able to build with the patch and boot the mtlrvp platform with the
subsequent patches in the train

Signed-off-by: Harsha B R <harsha.b.r@intel.com>
Change-Id: I377c4ff954a900c7b5193d7cab5554c6c02573ee
Signed-off-by: Jamie Ryu <jamie.m.ryu@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/70723
Reviewed-by: Subrata Banik <subratabanik@google.com>
Reviewed-by: Usha P <usha.p@intel.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/intel/mtlrvp/Makefile.inc

@@ -1,6 +1,9 @@
 ## SPDX-License-Identifier: GPL-2.0-or-later
 
 ramstage-y += ec.c
+ramstage-y += mainboard.c
+
+smm-$(CONFIG_HAVE_SMI_HANDLER) += smihandler.c
 
 VARIANT_DIR:=$(call strip_quotes,$(CONFIG_VARIANT_DIR))
 BASEBOARD_DIR:=$(call strip_quotes,$(CONFIG_BASEBOARD_DIR))

src/mainboard/intel/mtlrvp/mainboard.c

@@ -0,0 +1,45 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include <device/device.h>
+#include <drivers/intel/gma/opregion.h>
+#include <ec/ec.h>
+#include <ec/intel/board_id.h>
+#include <soc/ramstage.h>
+#include <smbios.h>
+#include <stdint.h>
+#include <string.h>
+
+const char *smbios_system_sku(void)
+{
+	static char sku_str[7] = "";
+	uint8_t sku_id = get_rvp_board_id();
+
+	snprintf(sku_str, sizeof(sku_str), "sku%u", sku_id);
+	return sku_str;
+}
+
+const char *mainboard_vbt_filename(void)
+{
+	return "vbt.bin";
+}
+
+void mainboard_update_soc_chip_config(struct soc_intel_meteorlake_config *cfg)
+{
+	/* TODO: Update mainboard */
+}
+
+static void mainboard_init(void *chip_info)
+{
+	if (CONFIG(EC_GOOGLE_CHROMEEC))
+		mainboard_ec_init();
+}
+
+static void mainboard_enable(struct device *dev)
+{
+	/* TODO: Enable mainboard */
+}
+
+struct chip_operations mainboard_ops = {
+	.init = mainboard_init,
+	.enable_dev = mainboard_enable,
+};

src/mainboard/intel/mtlrvp/smihandler.c

@@ -0,0 +1,30 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include <cpu/x86/smm.h>
+#include <ec/google/chromeec/smm.h>
+#include <intelblocks/smihandler.h>
+#include <baseboard/ec.h>
+
+void mainboard_smi_espi_handler(void)
+{
+	if (!CONFIG(EC_GOOGLE_CHROMEEC))
+		return;
+
+	chromeec_smi_process_events();
+}
+
+void mainboard_smi_sleep(u8 slp_typ)
+{
+	if (!CONFIG(EC_GOOGLE_CHROMEEC))
+		return;
+
+	chromeec_smi_sleep(slp_typ, MAINBOARD_EC_S3_WAKE_EVENTS, MAINBOARD_EC_S5_WAKE_EVENTS);
+}
+
+int mainboard_smi_apmc(u8 apmc)
+{
+	if (CONFIG(EC_GOOGLE_CHROMEEC))
+		chromeec_smi_apmc(apmc, MAINBOARD_EC_SCI_EVENTS, MAINBOARD_EC_SMI_EVENTS);
+
+	return 0;
+}